This theme was inspired by this art. This art was painted by Watanabe Seitei (Shotei).
File:Watanabe Seitei - Bird on a Flowering Branch.jpg - Wikimedia Commons https://commons.wikimedia.org/wiki/File:Watanabe_Seitei_-_Bird_on_a_Flowering_Branch.jpg
Watanabe Shōtei - Wikipedia https://en.wikipedia.org/wiki/Watanabe_Sh%C5%8Dtei